[Supras] Problems....

[Harley]

I took my 87 supra out the other day. Went about 8 miles and parked it at the store. I came out, started her up and started to leave. As soon as pulled out into the street and gave it some gas she just putted rapidly until I got over 3000 rpms. Shifted into 2nd and she did the same thing. She runs fine when its in high rpms. Then she putts when I boost anything over 5 lbs. I know the turbo was going out but would that effect the car at low rpms? She also has a rough idle. During idle it will miss here and there. Its not a steady miss though.

Any idea what it may be?

- Harley(87t)